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Two of Greece’s most dangerous volcanoes share an underground link

A January earthquake swarm exposed shared plumbing between Santorini and Kolumbo

Greece's volcanic Santorini island, shown here, competes for magma with nearby Kolumbo volcano.

This ring of rock around a sunken volcano’s caldera is Greece’s Santorini island. It and neighboring submerged volcano Kolumbo are connected to the same underground source of magma, researchers say.

Lepretre Pierre

By Carolyn Gramling

An intense swarm of earthquakes around Greece’s Santorini Island in January has revealed a fiery underground link between two neighboring and historically explosive volcanoes.